Like the stem of a pine tree, what are the characteristics of the stem of a pine tree

Pine resin pine resin (pine oleoresin) [sōng zhǐ] Oleoresin, which comes out of the body of a pine tree. The product of the physiological activity of trees, which is mainly composed of terpenoids. The freshly flowed pine resin is a colorless and transparent oily liquid, which thickens with the gradual volatilization of terpene hydrocarbons after exposure to air, and finally becomes a white or yellow solid substance - hairy rosin.

Pine resin is the raw material for the manufacture of rosin and turpentine. Formation and composition The sugars produced by photosynthesis in the pine needles undergo complex biochemical changes to form pine resin in the parenchyma cells of the wood, which penetrates into the resin tract through the lipid cell wall. The resin tract is a structure unique to the pine tree, forming three separate systems in the xylem, conifer, and primary cortex.

There are two types of resin channels in the xylem, longitudinal and transverse, which communicate with each other in the wood to form a resin channel. When harvesting pine resin, as long as the xylem of the outer edge of the trunk is cut, the pine resin will flow out through the resin system. Pine resin is mainly composed of resin acids and terpene hydrocarbons, in addition to containing small amounts of impurities and moisture.

The content of resin acids and terpenes varies depending on the species, the place of origin, the method of resin harvesting, and the storage period. Masson pine resin generally contains about 75 resin acids and 20 terpene hydrocarbons, and the rest is moisture and impurities. There are two types of resin acids in pine resin:

Abietic acid, including abietic acid, L-sea pine acid, longifoliic acid, neoabietic acid, and dehydroabietic acid, is the main part of resin acid. Maritime pine acidic acids, including sea pine acid, isosea pine acid. Masson pine resin contains more L-sea pine acid, but in the process of processing, it is heated to form other abietic acid, so rosin basically does not contain L-sea pine acid, and contains more other abie acid, especially abietic acid.

Pinus sinensis contains dicarboxyl resin acids. The terpene hydrocarbons in pine resin are mainly a-pinene and -pinene. The contents of the two varied greatly with the species and region.

In addition, there are -phellylene, camphene, geranidene, prene, longphyllene, caryophyllene, etc. China's pine resin contains very little carbonene.

The stems of pine trees are woody, and the stems of elephant tails are herbaceous.

Characteristics of pine stems: Pine trees belong to erect stems, and those whose stems grow upright vertically on the ground are called erect stems. When the pine trees are young, the crown is pyramid-shaped, and the branches are mostly in the shape of a wheel.

After the seedlings are unearthed and the cotyledons are born, the first ones are primary leaves, solitary, spirally arranged, linear-lanceolate, and the leaf margins are toothed.

It takes 1 3 years for the primary leaves to function as leaves, and needles appear, usually in bundles, at the tips of short branches. Each bundle of needles has leaf sheaths at the base, which fall off or remain in the early stages. The position of the resin tract in the mesophyll tissue is relatively constant in adult plants, and can be divided into three types: exophytic, mesophytic and endophytic.

Characteristics of the pine tree:

1. The branches are straight.

The peculiarities of the pine tree are manifested in the branches. Pine trees are evergreen trees or shrubs, and in the process of growth, their branches are always in an upright and straight state, even if the plant is skewed due to external factors, it will grow in the direction of skew, and the branches will not bend.

2. Evergreen in all seasons.

The peculiarities of the pine tree are manifested in the leaves. In the process of growth, the leaves of the pine tree are green all year round, although the leaves will fall in all seasons, but after the leaves are dropped, new leaves will grow for growth, and the pine tree is tall and can grow to a height of 75 meters.

3. Strong drought resistance.

The characteristics of pine trees are manifested in their habits. The leaves of the pine tree are needle-shaped, and this shape helps the plant to reduce water consumption, which makes the pine tree more resistant to drought, and the pine tree has more branches and leaves, which can absorb moisture from the air and use it for its own growth.

1. The pine tree is like a warrior who is not afraid of difficulties, like a small tower that stands tall.

2. The pine tree is like a majestic sentinel, like a green tower, protecting us.

The pine tree really wants to be a warrior who is not afraid of difficulties, towering in all corners, silently contributing its green.

The pine tree is like a soldier who stands upright.

The pine tree is like a warrior guarding the post.

The pine tree resembles a soldier standing upright.

The pine tree was like a small tower that stood tall.

The pine tree is really like a group of majestic sentinels, strong, upright, persistent, upright, simple, sticking to their posts, protecting us all the time.

The pine tree really looked like a majestic steel guard who stood at his post.

The pine tree was like a big green umbrella.

Like a great man, more like a spirit! Pine tree 1 should be compared to an object at the beginning, and then to a spirit at the next step. From shallow to deep.

Like a towering pagoda, like a big umbrella.

The leaves of the pine tree are like silver needles.

Pine trees, there are nearly 80 kinds of pine trees in the world, not only many species, but also widely distributed, such as Pinus tabuliformis, Pinus sylvestris, Black Pine and Scots Pine distributed in North China and Northwest Provinces, Masson pine, Huangshan pine, alpine pine in Central China provinces, Bashan pine in Qinba Mountains, as well as Taiwan pine and North American breviphylla pine, most of them are the main tree species in China's barren mountain afforestation. The three-needle and one-bunch clover pine include whitebark pine distributed in Qinling Mountains and Guanshan forest areas, Yunnan pine and Simao pine in Sichuan-Yunnan region, wetland pine and torch pine introduced in South China. There are few species of pine trees with four needles and a bunch, and they are only found in California, USA.

In addition, oocepine, Ravelson pine are four- or five-needle bundles. There are many kinds of pine trees with five needles and a bunch, and they are widely distributed, including Korean pine in the northeast, Huashan pine in the northwest and southwest provinces, as well as Qiao pine, Guangdong pine, Anhui five-needle pine, Dabie Mountain five-needle pine, Yan pine, Taiwan fruit pine, etc. The vast majority are tall trees, 20 to 50 m tall and up to 75 m tall (sugar pine in the United States, and a few are shrub-like, such as the pine (and Pinus terrasis).

Pine trees are wheel-shaped branches, with long internodes, relatively thin and straight branches or slightly curved downwards, and slender needles in bundles. The canopy of the tree does not look compact, and the word "pine" is a visual description of the characteristics of its canopy. Therefore, "pine" is a type of tree with a canopy pine.

Pine trees are sturdy and have a very long lifespan.

The pine tree is like a warrior in green clothes, like a green tower that defends us, like an indomitable people.

The pine tree is like a warrior, like a warrior with courage.

The stems of the pine tree are vertical, the crown of the young tree is pyramidal, and the bulbs are unisexual and monoecious. Pine tree characteristics: leaf characteristics, pine leaves are solitary when they are born, and the edges will have fine serrations; Growth characteristics, pine leaves are in a green growth state all year round, and the leaves will fall off after they grow; Longevity, pine trees also have a long lifespan, most varieties have a lifespan of more than 100 years.

The stems of pine trees are vertical stems that grow upwards perpendicular to the ground, and the crown is pyramidal in the young stage, and the branches are mostly in rotation. The cones of the pine tree are unisexual and monoecious, and the cones are mostly composed of seed scales, which will be lignified when they are ripe, and will open after a period of maturity, and the seeds will fall immediately.

1. Blade characteristics

The leaves of the pine tree are solitary at birth, arranged in spiral disks, linear-lanceolate, with serrated edges and needle-like, often 2 or 3 or 5 needles in a bunch. The needle-shaped leaves help the pine tree reduce nutrient consumption, increase the plant's own drought resistance, and the abundant branches and leaves allow the pine tree to absorb water from the air and maintain its own growth.

2. Growth habits

The leaves of pine trees grow green all year round, and although they fall off throughout the year, new leaves are grown after they fall. And the overall growth rate is fast, the plant size is high, and it can grow up to a height of 75 meters, which is very spectacular.

3. Longevity

Pine trees also have a long lifespan, many varieties of pine trees have a lifespan of more than 100 years, some varieties can bear fruit after 5 to 6 years of maintenance, and some need to be maintained for decades to bear fruit. In addition, pine trees are also extremely adaptable to the environment, with a maximum temperature of 50 and a low temperature of -60.

The leaves of coniferous pine resemble needles.

The leaves of the pine tree are like needles. It belongs to the coniferous leaves.